Ultrasensitive Temperature Sensor Based on Refractive Index Liquid-Sealed Thin-Core Fiber Modal Interferometers

An ultrasensitive temperature sensor based on a thin-core fiber modal interferometer (TCFMI) is proposed and demonstrated in this paper. After its middle is etched to a thin residual diameter, the TCFMI is sealed in a capillary tube filled with refractive index (RI) liquid. The thermo-optic effect o...

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Bibliographic Details
Published inIEEE sensors journal Vol. 14; no. 4; pp. 1179 - 1184
Main Authors Xu, Ben, Li, Jianqing, Li, Yi, Xie, Jianglei, Dong, Xinyong
Format Journal Article
LanguageEnglish
Published New York IEEE 01.04.2014
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Fiber sensors
Interferometers
modal interferometer
Optical fiber sensors
Optical fibers
Sensitivity
temperature
Temperature measurement
Temperature sensors
thin-core fiber
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Summary:An ultrasensitive temperature sensor based on a thin-core fiber modal interferometer (TCFMI) is proposed and demonstrated in this paper. After its middle is etched to a thin residual diameter, the TCFMI is sealed in a capillary tube filled with refractive index (RI) liquid. The thermo-optic effect of RI liquid turns the TCFMI into an ultrasensitive temperature sensor with sensitivity up to -22.23 nm/ ° C at 3.2 ° C. The sensitivity is over 1000-fold that of the bare TCFMI in air. This proposed temperature sensor is also simple, cost-effective, and suitable for a variety of applications.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2013.2294012